A5008454124- Carbon Nanotubes in Composites
- Graphene research and applications
- Nanopore and Nanochannel Transport Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Supercapacitor Materials and Fabrication
- Covalent Organic Framework Applications
- Membrane Separation and Gas Transport
- Catalytic Processes in Materials Science
- Phase Equilibria and Thermodynamics
- Spectroscopy and Quantum Chemical Studies
- Zeolite Catalysis and Synthesis
- Supramolecular Self-Assembly in Materials
- Advancements in Battery Materials
- Conducting polymers and applications
- Carbon Dioxide Capture Technologies
- Fullerene Chemistry and Applications
- Mesoporous Materials and Catalysis
- Advanced Battery Materials and Technologies
- Polydiacetylene-based materials and applications
- Catalysis and Oxidation Reactions
- Magnetic and transport properties of perovskites and related materials
- X-ray Diffraction in Crystallography
- Luminescence and Fluorescent Materials
- Crystallization and Solubility Studies
- Electrochemical Analysis and Applications
Chiba University
2016-2025
University of Yamanashi
2025
Graduate School USA
2016-2017
Université Paris-Saclay
2016
CEA Paris-Saclay
2016
Centre National de la Recherche Scientifique
2016
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016
Gakushuin University
2006-2012
Ōtani University
2004-2010
Shinshu University
2004-2010
We report the use of chemical vapor deposition (CVD) for bulk production (grams per day) long, thin, and highly crystalline graphene ribbons (<20-30 microm in length) exhibiting widths 20-300 nm small thicknesses (2-40 layers). These layers usually exhibit perfect ABAB... stacking as graphite crystals. The structure has been carefully characterized by several techniques electronic transport gas adsorption properties have measured. With this material available to researchers, it should be...
The synthesis, structural changes, and nitrogen gas sorption isotherm of a porous metal−organic framework (PMOF) comprising stacked two-dimensional sheets are reported. This compound easily loses guest molecules shrinks its interlayer distance. guest-free species show unique double-step isotherm. Sorption X-ray analyses have clarified that the first uptake is micropore filling, while second originates from clathrate formation. explains total amount corresponding to about double original void...
We report a precise control over the hierarchy levels in outstanding self-organization process shown by chiral azobenzene dimer 1. This compound forms uniform toroidal nanostructures that can hierarchically organize into nanotubes under temperature, concentration, or light. The further organized supercoiled fibrils, which finally intertwined to form double helices with one-handed helical sense.
Selective synthetic routes to coordination polymers [Cu(bpy)2(OTf)2]n (bpy = 4,4′-bipyridine, OTf trifluoromethanesulfonate) with 2- and 3-dimensionalities of the frameworks were established by properly choosing each different solvent–solution system. They show a quite similar local environment around Cu(II) centers, but these assemble in way leading 2D 3D building-up structures. Although two kinds porous (PCPs) both have flexible frameworks, shows more marked flexibility than 3D, giving...
Abstract Unlike classical covalent polymers, one-dimensionally (1D) elongated supramolecular polymers (SPs) can be encoded with high degrees of internal order by the cooperative aggregation molecular subunits, which endows these SPs extraordinary properties and functions. However, this has not yet been exploited to generate dynamically control well-defined higher-order (secondary) conformations SP backbone, may induce functionality that is comparable protein folding/unfolding. Herein, we...
Abstract The supramolecular design of photochromic molecules has produced various smart molecular assemblies that can switch their structures and/or functions in response to light stimuli. However, most these require large structural changes the for an efficient conversion assembled states, which often suppresses photoreactivity within self-assemblies. Here we report assemblies, based on a photo-cross-linkable chromophoric dyad, small amount ultraviolet-generated photochemical product guide...
Supramolecular polymers undergo self-folding on a time scale of days into topologies resembling the protein’s tertiary structures.
The interaction of water with hydrophobic surfaces is quite important in a variety chemical and biochemical phenomena. coexistence oil can be realized by introduction surfactants. In the case vapor adsorption on graphitic nanopores, plenty adsorbed nanopores without surfactants, although surface not hydrophilic. Why are molecules remarkably? This work give an explicit insight to graphite using experimental theoretical approaches. Water associated each other form cluster 1 nm size, leading...
We synthesized two high-pressure polymorphs PbNiO(3) with different structures, a perovskite-type and LiNbO(3)-type structure, investigated their formation behavior, detailed structural transformation, thermal stability, valence state of cations, magnetic electronic properties. A at 800 °C under pressure 3 GPa crystallizes as an orthorhombic GdFeO(3)-type structure space group Pnma. The reaction high was monitored by in situ energy dispersive X-ray diffraction experiment, which revealed that...
The crystal structure of [Cu(4,4'-bipyridine) 2(CF 3SO 3) 2] n metal-organic framework (CuBOTf) one-dimensional pore networks after pre-evacuation at 383 K was determined with synchrotron X-ray powder diffraction measurement. Effective nanoporosity the pre-evacuated CuBOTf N 2 adsorption 77 K. experimental H and D isotherms 40 were measured then compared GCMC-simulated using effective nanoporosity. quantum-simulated Feynman-Hibbs potential coincided ones, giving a direct evidence on quantum...
It is important to study the interaction between water molecules and a host structure for understanding adsorption mechanism of metal-organic framework (MOF) materials. The evolution flexible Cu-MOF, {[Cu(bpy)(H2O)2(BF4)2](bpy)} (bpy = 4,4′-bipyridine), upon dehydration rehydration was studied by thermogravimetric analysis (TGA), infrared (IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), adsorption. A nearly reversible structural change observed rehydration....
An outstanding compression function for materials preparation exhibited by nanospaces of single-walled carbon nanohorns (SWCNHs) was studied using the B1-to-B2 solid phase transition KI crystals at 1.9 GPa. High-resolution transmission electron microscopy and synchrotron X-ray diffraction examinations provided evidence that nanocrystals doped in nanotube spaces SWCNHs pressures below 0.1 MPa had super-high-pressure B2 structure, which is induced above GPa bulk crystals. This finding...
The N2 adsorption on the internal and external surfaces of single-walled carbon nanotubes continuous model at 77 K was compared with that structureless graphite surface grand canonical Monte Carlo (GCMC) simulation. inapplicability BET analysis for evaluation area nanotube explicitly shown reason explained monolayer structure difference. ordinary αS-plot using standard isotherm flat did not provide a reasonable method area. However, if we adopt pore width being large enough to remove...
Elastic layers: By comparing the gas adsorptivities of N2, O2, CO2, and H2 on two elastic layer-structured metal–organic frameworks (MOFs) with different metal ions, definite differences could be observed in despite their structural similarity. In most cases MOFs, ion has been considered as a connector. However, clearly potential to regulate adsorptivity especially flexible MOFs.
Graphene and graphitic nanoribbons possess different types of carbon hybridizations exhibiting chemical activity. In particular, the basal plane honeycomb lattice consisting sp(2)-hybridized atoms is chemically inert. Interestingly, their bare edges could be more reactive as a result presence extra unpaired electrons, for multilayer graphene nanoribbons, terraces ripples introduce additional this study, remarkable irreversibility in adsorption CO(2) H(2)O on was observed at ambient...
Abstract Water surrounded by hydrophobic interfaces affects a variety of chemical reactions and biological activities. Carbon nanotubes (CNTs) can be used to investigate the behavior water at interfaces. Here, we determined fundamental unit evaluating ice‐like cluster formation in limited nanospaces CNTs, using X‐ray diffraction molecular simulation analysis. The CNTs with diameter 1 nm had fewer hydrogen bonds than bulk under ambient conditions. In diameters 2 3 nm, formed nanoclusters even...
We report a combined experimental (X-ray diffraction) and theoretical (molecular dynamics, hybrid density functional theory) study of 1-ethyl-3-methylimidazolium chloride, [C2C1MIM][Cl], inside carbon nanotubes (CNTs). show that despite its huge viscosity [C2C1MIM][Cl] readily penetrates into 1-3 nm wide CNTs at slightly elevated temperatures (323-363 K). Molecular simulations were used to assign atom-atom peaks. Experimental simulated structures RTIL CNT in bulk phase are good agreement....
This study investigates the interplay between organic solvent geometry and divalent cation dynamics in liquid electrolytes, emphasizing their relevance for energy storage systems. Using molecular simulations, structural transport properties of Mg²⁺ Ca²⁺ were evaluated cyclic (ethylene carbonate, EC; propylene PC) linear (ethyl methyl EMC) solvents presence TFSI⁻ anions across a range temperatures. Results reveal that exhibits superior diffusion compared to due its smaller ionic radius weaker...
The continuous increase in global energy consumption has caused a considerable CO2 emissions and environmental problems. To address these challenges, adsorbents catalytic materials that can effectively reduce the levels atmosphere should be developed. Metal–organic frameworks (MOFs) have emerged as promising for capture owing to their high surface areas tunable structures. Herein, adsorption properties of MIL-100(Fe) UiO-66(Zr) were investigated. Both MOFs exhibited excellent thermal...
The stabilities of water molecules in carbon slit-shaped nanospaces have been studied using the potential calculation for possible clusters (H2O)n n = 2−12. adsorption isotherm on a graphite slit pore (w 1.1 nm) with no surface functional groups at 303 K was calculated GCMC simulation TIP-5P and 10-4-3 Steele functions; this simulated has vertical uptake P/P0 0.5. cluster growth along evidenced through snapshot simulation. agreed well experimental an activated fiber (ACF) having uniform...